blob: 004db791609647b69981d8397c4e1d5517ba9a32 [file] [log] [blame]
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include "webrtc/media/engine/internalencoderfactory.h"
#include <utility>
#include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
#include "webrtc/modules/video_coding/codecs/vp8/include/vp8.h"
#include "webrtc/modules/video_coding/codecs/vp9/include/vp9.h"
#include "webrtc/system_wrappers/include/field_trial.h"
namespace cricket {
namespace {
// If this field trial is enabled, the "flexfec-03" codec will be advertised
// as being supported by the InternalEncoderFactory. This means that
// "flexfec-03" will appear in the default SDP offer, and we therefore need to
// be ready to receive FlexFEC packets from the remote. It also means that
// FlexFEC SSRCs will be generated by MediaSession and added as "a=ssrc:" and
// "a=ssrc-group:" lines in the local SDP.
bool IsFlexfecAdvertisedFieldTrialEnabled() {
return webrtc::field_trial::IsEnabled("WebRTC-FlexFEC-03-Advertised");
} // namespace
InternalEncoderFactory::InternalEncoderFactory() {
if (webrtc::VP9Encoder::IsSupported())
if (webrtc::H264Encoder::IsSupported()) {
cricket::VideoCodec codec(kH264CodecName);
// TODO(magjed): Move setting these parameters into webrtc::H264Encoder
// instead.
codec.SetParam(kH264FmtpLevelAsymmetryAllowed, "1");
if (IsFlexfecAdvertisedFieldTrialEnabled()) {
cricket::VideoCodec flexfec_codec(kFlexfecCodecName);
// This value is currently arbitrarily set to 10 seconds. (The unit
// is microseconds.) This parameter MUST be present in the SDP, but
// we never use the actual value anywhere in our code however.
// TODO(brandtr): Consider honouring this value in the sender and receiver.
flexfec_codec.SetParam(kFlexfecFmtpRepairWindow, "10000000");
FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
InternalEncoderFactory::~InternalEncoderFactory() {}
// WebRtcVideoEncoderFactory implementation.
webrtc::VideoEncoder* InternalEncoderFactory::CreateVideoEncoder(
const cricket::VideoCodec& codec) {
const webrtc::VideoCodecType codec_type =
switch (codec_type) {
case webrtc::kVideoCodecH264:
return webrtc::H264Encoder::Create(codec);
case webrtc::kVideoCodecVP8:
return webrtc::VP8Encoder::Create();
case webrtc::kVideoCodecVP9:
return webrtc::VP9Encoder::Create();
return nullptr;
const std::vector<cricket::VideoCodec>&
InternalEncoderFactory::supported_codecs() const {
return supported_codecs_;
void InternalEncoderFactory::DestroyVideoEncoder(
webrtc::VideoEncoder* encoder) {
delete encoder;
} // namespace cricket